Juha Niskanen wrote: > 2007/8/13, Jan Kiszka <[EMAIL PROTECTED]>: >> Juha Niskanen wrote: >>> Is it possible to use only RT network device driver and lett non-RT stcaks >>> do >>> the rest? >> You mean what the rtnetproxy does (see documentation)? It's not complete >> (only TCP forwarding), and it can easily break determinism of your box, >> but maybe you are fine with it. > > Like that, but every thing should go through it. > >>> Like have only a hard_start_xmit and an interrupt handler function in RT. >> Sorry, I don't get what you mean. > > The problem is that I need RT(Xenomai and RTDM) but it decrease performance > of Ethernet driver compared to vanilla kernel. There are lot of > latency variation > and some packet lost. With RTnet results are good, but it is complicate use > and > I don't need rt tcp/ip stack.
If you don't need RT networking, latency variation should not bother you. Of course, packet lost is something different. What is your RT load? Do you have long pauses where Linux is unable to run? Maybe you want to discuss this side-effect of using Xenomai on xenomai-help. > > So I would like to have RTDM but not Rtnet. > Is it possible to have only sending and receiving functions in RTDM > and rest of interface for normal network device interface. Like miitool,.. Besides that this is also complicated, keep in mind that the more non-critical stuff you drag into the RT domain, the less predictable your system becomes (actually, it can get totally unpredictable quickly). So, either you need RT networking, then RTnet may be the choice, or you just need to compensate side-effects of your RT load on the Linux networking stack. In the latter case, we may continue on xenomai-help. Jan
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